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Update key value where another key equals some value in MongoDB?
Use $elemMatch fir this with $set
Let us first create a collection with documents −
> dbkeyValueDemoinsertOne( { "_id" : new ObjectId(), "CustomerDetails" : [ { "Name" : "Chris", "Age" :24, }, { "Name" : "Robert", "Age" :29, }, { "Name" : "David", "Age" :35, } ] } ); { "acknowledged" : true, "insertedId" : ObjectId("5cefcf36ef71edecf6a1f6bf") }
Following is the query to display all documents from a collection with the help of find() method −
> dbkeyValueDemofind()pretty();
Output
{ "_id" : ObjectId("5cefcf36ef71edecf6a1f6bf"), "CustomerDetails" : [ { "Name" : "Chris", "Age" : 24 }, { "Name" : "Robert", "Age" : 29 }, { "Name" : "David", "Age" : 35 } ] }
Here is the query to update key value where different key equals some value −
> dbkeyValueDemoupdate( {"CustomerDetails":{"$elemMatch":{"Name":"David"}}}, {"$set":{"CustomerDetails$Age":56}}); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 } )
Let us check the document once again −
> dbkeyValueDemofind()pretty();
Output
{ "_id" : ObjectId("5cefcf36ef71edecf6a1f6bf"), "CustomerDetails" : [ { "Name" : "Chris", "Age" : 24 }, { "Name" : "Robert", "Age" : 29 }, { "Name" : "David", "Age" : 56 } ] }
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